| [circulating vaccine-derived poliovirus type 2 outbreak in democratic republic of congo 2011-2012]. | according to the who records of 2013, the incidence of poliomyelitis was reduced by more than 99%, the number of endemic countries decreased from 125 in 1988 to 3 in 2013 and over 10 million cases were prevented from poliomyelitis thanks to the intensive use of oral polio vaccine (opv). however, the emergence of circulating vaccine-derived poliovirus strains (cvdpv), causing serious epidemics like the wild poliovirus, is a major challenge on the final straight towards the goal of eradication and ... | 2015 | 26288132 |